manzel



A. W. F. MANZEL.

Fonos FEED Lumcmo.v

APPLICATION FILED JULY 1.1918.

, 1,323,603. Patented ne... 2,1919.

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A. W. F. MANZEL.

FORCE FEED LUBRICATOH.

APPLICATION FILED JULY I. 191.8. 1,323,603. yPatented De. 2,1919.

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ADOLPH W. F. MANZEL, OF BUFFALO, NEW YORK, ASSIGNOR TO MANZEL BROTHERS COMPANY, OF BUFFALO, NEW YORK, A COBEOBATION OF NEW YORK.

- primary and secondary pumps and an intermediate sight glass or chamber, although the invention is equally applicable to lubricators having a single pump.

, Check valves, usually of the ball or the conical type have heretofore been placed in the inlet and discharge passages of the oil pump or pumps, but such valves have the objection that dirt or other `foreign substances are liable to lodge under them or upon their seats and prevent full closure of the valves with the result that the efficiency of the pump is more or less impaired.

@ne of the'objectsof my invention is the provision of a check valve or valves located wholly outside of the inlet and discharge conduits of the pumps, and reliable in operation under all conditions, leaving the conduits free and unobstructed and insuring the proper operation of the lubricator.

A further object is to so construct the pumps as to prevent leakage of oil and insure the full capacity of the pumps in all adjustments of the plungers.

ln the accompanying drawings:

Figure 1 is a vertical section of a lubricator embodying-the invention. Fig. 2 isa similar section showing adilierent position of the parts. Fig. 3 is a vertical section at right angles to Fig. l.

Similar characters of reference indicate corresponding parts in the several views.

1 indicates the oil reservoir. As is com-- mon in this class of lubricators, the reservoir contains a plurality of pump units, a

greater or less number being employed according to the 'number of bearings or other parts to be lubricated. For simplicity of illustration, but one of such units is shown in the drawings. Each unit comprises a' primary barrel or cylinder 2 containing the plunger 3 and a secondary barrel 4 containing the plunger 5. These plungers are operated in unison by an eccentric 6 mounted on a transverse shaft 7 and ccperating with Specification of Letters Patent.

Patented Dec. 2, 1919.

Application nea July 1, 191e., serial no. 242,706.

a yoke 8 to which the plungers are connected. This shaft may be rotated by the usual pawl 7 and lratchet 7 b, or any other suitable drivingA mechanism. Suitable means are provided for adjusting the primary plunger vertically in this yoke to increase or diminish its eiiective stroke and regulate the oil feed accordingly, in a well known, manner. ln the construction shown, this is accomplished by arranging the screw threaded upper end of the primary plunger in a nut 9 by the primary plunger during a part ot` its downward or eective stroke, as shown in Fig. 2, and to be uncovered to admit oil 'to the barrel during a part of the upward vstroke of said plunger as shown in Fig. 1.

`carriedby the yoke. A rotary regulating Connected with the portion of the primary I barrel below or beyond its junction with the oil inlet passage or conduitl, is a discharge tube or conduit 14 extending upwardly into a sight chamber 15 having the usual transy parent panes or glasses. The downwardlybent upper end of this tube discharges the drops of oil into the usual cup 16 whence it flows through a tube 1*( intothe inlet passage 18 of the secondary pump barrel 4. This inlet enters the side of said barrel similar to the inlet of the primary pump, and below the inlet 18 is the discharge passage or conduit 19` leading from the secondary barrel to the usual connection 20 from which the oil under pressure is delivered to the part to be lubricated.

ln addition to the side discharge or connection, the lubricator preferably has a bottom discharge 20a, so that either may be used according to the location of the part to be lubricated. The unused discharge is closed by a suitable plug or cap.

Located in the lower or front end of the primary pump barrel is a check valve 2l, preferably of the piston type, adapted to be depressed by the primary plunger on its forward stroke to permit the discharge of Sti 1 ,atascos the lubricant from said barrel into and through the tube ll leading to the sight chamber and which valve follows said plunger on its return stroke, so as to close the adjacent end of said tube and prevent the return of the lubricant through it. .This check valve is of the proper diameter to fit the bore of the primary barrel and is pressed against the front end of the plunger by a spring Q2 preferably seated in the valve which is hollow for this purpose, and in a chambered plug'or capY 23 screwed into an enlargement or extension 24 at the lower end of the barrel. This spring tends constantly to urge the valve toward the plunger, so as to bear against it and follow it during a predetermined portion of its return stroke. The valve is provided with a stop, preferably in the form of an outwardly projecting liange 25, arranged at its lower end and adapted to encounter the upper end of said enlargement to arrest the upward movement of the valve after it has covered and cut off the discharge conduit 14.

ln the operation of the primary pump, the spring-pressed check valve 21 follows the ascending` plunger until said valve cuts off the discharge conduit 14, when the valve is arrested by its stop 25. The plunger, however, continues its return or suction stroke, leaving a space between it and the check valve into which a charge of oil is drawn. Upon the forward stroke of the plunger, the check valve is depressed by the intermediate column of oil and as soon as the valve uncovers said discharge conduit, the charge of oil is forced through it into the cup 16 and delivered to the secondary pump which in turn feeds the oil to the part to be lubricated.

Any oil which may leak past the check valve of the primary pump is returned into the reservoir through a relief passage 24a, thus preventing blocking of said valve. This valve is lubricated by oil entering through this passage.

The barrel of the secondary pump is provided with a spring-pressed check valve 26 identical with the valve 21 and operating in the same manner. To insure the ascent of the check valve 26 and prevent binding or holding down thereof by the back pressure in the discharge passage 19, in pumping against more or less pressure, means are provided for balancing the same. For this purpose, an equalizing passage 27 is preferably extended from said discharge passage to the chamber or enlargement 28 in which the flanged lower end of the check valve plays. l/Vhen the oil is delivered through the bottom connection 20, this equalizing passage also serves as a discharge passage.

rl`his passage also permits the use of a comparatively light return spring for the piston valve 26. W'ithout such a passage a very heavy and powerful spring would be necessary in pumping against pressure, requiring correspondingly greater power to depress and open the valve on the effective stroke of the plunger.

This construction is further desirable in that it does not require the use of an additional ball or conical check-valve in the delivery passage of the lul'nicator.

By maintaining a close contact between the check valves and the plungers during the initial ascent of the latter, a strong suction is obtained and the full capacity of the pumps in all adjustments of their plun gers is insured.

By controlling the flow of the lubricant through the inlet and discharge passages of the pump barrels by means of parts located within the barrel and wholly outside of said passages, the latter always remain free and clear and are not liable to become clogged like the passages of lubricants having balls or similar check valves arranged therein. A. uniform and reliable action of the pump is thereby secured at all times.

This construction also simplifies the lubricator and reduces its cost of production.

The combined lubricating and relief passage 211 in cooperation with the adjustable plunger 3 produces the important result of insuring a practically uniform and constant stroke of the valve 21 and an invariable feed of the oil, in all adjustments of said plungerj ,Such pumps must often be nicely regulated to feed periodically a very small quantity of oil, such as a fraction of a drop for each stroke of said plunger. It is, therefore, essential that the piston-valve 21 should not only be properly lubricated, but should be reliable in action and'free to wholly open or descend under all conditions. ln the absence of said relief passage, any oil leaking into the space below said valve would shorten its stroke more or less and ultimately block it, thus interfering with o r modifying the feed and rendering it variable and uncertain.

`When the lubricator is to contain six pump units, the shaft 7 is preferably of hexagonal cross section and the eccentrics are removably mounted thereon and provided with corresponding openings to receive the shaft. By this construction, the eccentrics are compelled to turn with the shaft without the use of set screws or other fastening devices and they can be readily adjusted a sixth of a turn ahead of one another, in an obvious manner, so that the pumps will operate successively and produce a practically continuous feed of oil. lf desired, the shaft and the openings of the eccentrics may be octagonal or of any other polygonal form.

l claim'as my invention:

1. ln a lubricator, the combination of an Y Y oil reservoir, a pump-barrel provided atits front end With an extension located Within the reservoir, said extension having a relief assage communicating WithA the reservoir, inlet and discharge conduits connected with the pump barrel, a plunger operating in the barrel, means for regulating the stroke of the plunger, and a spring-pressed piston- Valve arranged in sald extension` and the front portion of the barrel and controlling said discharge conduit.' f

2. In a lubricator, the combination of a pump-barrel having an inlet, a discharge conduit leading from one side of said barrel, a plunger operating in the barrel, a pistonvalve arranged in the front part of the barrel in line with the plunger for checking the returnof the Huid through said discharge conduit, means for moving `said valve toward the plunger, and a pressureequalizing conduit leading from said discharge conduit to the rear side of said valve.

3. In a lubricator, the combination of a .pump-barrel having an inlet, a discharge from said discharge `conduit to the rear-'side of said valve, and

an auxiliary discharge conduit leading from the rear side of said valve. ADOLPH W. MANZEL. 

